The OP is keeping a journal, so he has developed a real practice that works for him. I agree that a few sentences describing what he puts in there would have made this article stronger.

The second image of the journal page seems to show a list of possible approaches to a problem. The fourth image looks as if it has performance data and evaluation of a working system, so that is a couple of ideas. I think it is quite a brave thing to post the actual images. Perhaps fortunate the OP does not record team dynamics in his journal.

I work as a teacher, and I use a cheap page a day diary to record a few key points from each lesson. The 'readymade' aspect of the page a day diary seems to reduce the 'threshold' for making notes.